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here we are going to look at a fast simple and yet fairly accurate way of drawing parallel line

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for that we have been given this line AB over here and an external point P through which a

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line parallel to AB is to be drawn and we are supposed to use only these two set squares for

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that purpose we start by moving our first set square and keeping it in contact with the line

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then I will rotate it so that its edge here will align exactly with line AB

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then I am going to move the second set square so that its edge makes a firm

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line contact along with the first one then holding this set square firmly on

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the paper I am going to move this other one still retaining the line contact all

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along if required you should hold on to this and move the other one still retaining the line

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contact so you would realize that we are moving this set square towards p without ever tilting it

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so we are retaining what is called as its orientation and why is that orientation important

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because this edge here was once aligned along AB. So, we are sort of taking that AB or the

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direction of that AB and we are moving it towards P. We will keep doing that till we reach point P

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here and once we are there, we are ready to draw the line. And now you can see that we have a line

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through P which is parallel to AB as required. This simple construction will be using very often

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to do more complex constructions.